Plug valve



Aug 15, 1950 o. JAcoBsEN i 2,518,790

PLUG vALvE Filed Jan. 5, 1945 2-SheetS-Sheet 1 ATTORN EYS Au8 15, 1950o. JAcoBsEN 2,518,790

PLUG VALVE Filed Jan. 5, 1945 2 Sheets-Sheet 2 INVENTOR l OYSTE INJACOBJEN,

ATTORNEYS Patented Aug. 175, 19540 PLUG vAnvn-l Qysterin Jacobsen,Montgomery County, Ohio, as` signor. to The Duriron.C0mpany,Inc.,l)l,ayton,

Ohio,v a corporation of New York Application January. 5, 1945; SeraliNooit-17,392;

Z'Claims. 1.,

This: inventionrelates to plug valves and, par.- ticularly, to,lubricatedvalves of this type. s

The; partieulary object, of. this inventiony is. to provide avlubricated plug; valve in. which the source of lubricant is whollyindependent ,of the plug and, valve stem andvalveA casing proper.

Howevenwhile the sourceof lubricant is located.

without difcult and expensive machining ofthe.

valve body or plug.

Lubricant is often introduced into plug Valves through the stern whichis attached to the plug. This requires that the stems be hollow and,therefore, weakened and subject to breakage. Also, the stem is often inan inconvenient place to insert the lubricant, which may be either astiff grease in the form of a stick or a liquid or semi-liquid' greaseor oil.

invention provides means whereby itv is possible to luloricateY a plugtype valve without boring or hollowingoutY the stem sok that not only isthe stein stronger, but also the lubricant introduced into the valvenearer to itspoint application.

Thus it is another object ofv thisn invention to provide a separatereservoir carried by the cap plate of a plug valve which is so disposedin a horizontal 1position-as to be `readily accessible for theintroduction of lubricants and the discharge thereof. By so locating theYreservoir in the cap plate a relatively short passageway sufiices toconduct the lubricant to a point adjacent. the periphery of the plug.Inthis manner tortuous passageways are eliminated and .the lubricant isdischarged `directly through ai relatively. short passageway to thesurface ofthe valve.

it is another, object toprovideay lubricated'.

plug valve having: the foregoing .advantages andy in which. thestern;itself receives lubricant from thev said reservoir so that. themanipulation of the valve is facilitated. Y

It is another object to provide4 a lubricated plug valve-inwhich thelubricant is continuously under pressure but in whichthere isa sealingrarrangement which. prevents loss ofv lubricant from the-valve.

Itl is. another objectof. this invention tof-pro.-

(lCl. 251793)' vvide:` ai. lubricated y plug valvev having; a clean, outport atthe; bottoms ofthe4 valve and for the lubricant: introduced at.the top oiv the valve so that; the valve-casing may. be ilushed out whenEhese and other. objects andr advantages will becomemore, apparent4 uponreference, to the attached; drawings inwhich:

Figure l isi ayertical section throughr a plug lglfvalve having thisinvention and is indicated by `the line l-inon: Figure,v 2, and.` alsoby the line lffl in,-Figur.e,2;

Figurel 2"a-.top plan View of the valve of ignite l showing;insectionthe lubricant preslgsure chamber;

Figure 3,:isfaverticalsection through the valve similar toliigure 1butishowingz-amodiediorm civ. lubricating. passageway and cleanv outplug;

FigureAisfzazse-ction on the lineY 4 4 of Figure 2 29f.slicoving:in.;more detail the passagewayfrom theV lubricating; chamber4 to thevalve.Aplug; and

Eiguref15fi'si1aview.' similarto Figure 4 showing the lubricatingpassageway. in. Figure 3.

Figure 6 is across-'sectionalview of enlarged 'r'gsize of the lowerportion of the valve body taken alongline: G'-GixrLEigure" l;

Figure 7i is: ai fragmentary longitudinal sectional; View.,` greatly:enlarged; showing the'strucn ture'. forming thelower'part ofthe valvecasing. 0C)l'llris.figuredis#taken.along the section line 1-1 in Figure6.

Reierringtothe drawings more in detail, the

body otlie valyeis.y indicated at I andcomprises n a con-icalbore 2';which is open at its upper end Ozas at. 3. Triel lower endof the body Ilispro- 'videdwith an enlarged? chamber 4, the bottom oi" whichis-provided with abosslhaving abore il therethrough. M Ountedfinfthepassageway 6 s-crew plug 9; the-head ofv which rests on 4Qffii-ibsAffcvnrn'iedinr4 a'recess in thelower surface of the cliamberxll;

A.' block 'I' is threaded to'- receive the plugy 9 and a sealing washer8 is placed between the 45mblcck 'I andthe boss 5.ozfthe valve body I.The

' block 'f1 isr also provided 4with-a threaded bore is whichintersects.thethreadedpassage Il which reeeivesthe screw 9.

'A screw i3. having ahead l Als4 adapted to be 50.iz1serted1into-thethreadedibore Ill of the blockr l.. The-ScrewI 9 has-acentral bore I2 sothat communication is:4 had between the chambers ligand: vIll: `It*willv be,l noted that the chamber L iaattaohed to the, -bod/gv I-without the said 55' body having been inachinehv Thus. the'body l:

3 may be made o silicon bearing iron or other non-corrosive metals.

In addition to providing for a passage for the flushing out of thevalve, the bore I in the block i also provides a chamber for receivingstick grease which may be discharged into the chamber 4 by the threadingof the screw I3.

Adapted to be received within the bore 2 is a valve plug I5 which has atransverse passage i6 therethrough for controlling the flow of liquid orgases through the valve. The block I5 is also provided with a pluralityof passages I1 which receive lubricant and thus facilitate the turningof the block i5 in the bore 2.

The valve member I5 is also provided with a stem I3, the upper end ofwhich extends upwardly from the casing I and through the cover plate I9.The cover plate is retained on the valve casing by the bolts 2li whichpass through the said cover plate and also through a retaining ring 2Iwhich abuts the shoulder 22 extending around the upper edge of thecasing I. A sealing ring 20a is disposed between the plate I9 and thevalve casing I so that any leakage of lubricant therebetween isprevented. The sealing ring 2te extends inwardly and lits closely aroundthe stem I8. An annular ring of material such as graphite or bronze liesbetween the sealing ring and the top of the plug I5 and is indicated at2Ia.

Bearing against the sealing ring 20a from above are rings of packing 22awhich are retained in position by a packing gland 23a. which is retainedin position by the bolts 41 which extend into the cover plate I9.

The cover plate I9 is provided with a laterally exposed tubularextension 23 which lies in a horizontal plane. This extensionconstitutes a lubricant pressure chamber which supplies grease or oil tothe valve block. The extension 23 is open at each end and one end isclosed by a fitting 24 which comprises a ball check 25 so that aconventional grease gun can be used to insert lubricant into the bore 26of the projection 23.

Inserted into the opposite end of the bore 26 is a screw 2'? whichserves as a cylinder for the piston 28 which is carried on a piston rod29. The end of the piston 28 is provided with a sealing: washer 30 whichis retained in position by a cap screw 3l.

The outer end of the piston rod 29 is provided with a head 32 whichengages with the end 33 of a force screw 21 when the piston is at thebottom of its stroke. A compression spring 34 is disposed between theend 33 and the piston 28 so that the latter is urged downwardly in thebore 2E toward the fitting 24.

'Ihe chamber 2G is connected by a laterally disposed passageway 35 and avertically disposed passageway 3e with the open end 3 of the valvecasing I. An opening 31 in the sealing ring 20a facilitates the passageof fluid into the said open end.

The packing gland 23a is provided with internally disposed shoulders 38for engaging the iats 39 of the stem I8 in order to limit its rotationin either direction. In this manner it can be determined whether thevalve is open or closed er in any intermediate position. Also by meansof the stops the passageways I1 are prevented frorn being positioned inalignment with either of the valve openings so that lubricant is notneedlessly lost into the liquid or gas which the valve is controlling.

stem I8 as well as the plug I5. facilitate the sealing around the ring42, the

In operation the chamber 26 is loaded with lubricant under pressure sothat the spring 34 is compressed. Thereafter, as the valve is turned inuse, the lubricant is gradually forced through the passageway 35, 36, 31and thence into the passageways I1 on the surface of the plug I5. Shouldit be desired to clean out the valve, the screw I3 may be removed and aquantity of lubricant forced in through the fitting 24 and thencethrough the grooves I1 into the chamber 4 and then through the passageI2 into the bore III.

Lubricant may also be introduced into the valve through the passage I0by placing a stick of grease into the passageway I and threading thescrew I3 downwardly until the grease is forced upwardly through thevalve and loads the spring 34.

Referring to the modifications shown in Figures 3 and 5 it will beobserved that the lubricant passes from the bore 26 into the passages 35and 36 and thence through the notch 40 into the bore 4I in the ring 42,which last is a member similar to the ring 2Ia of Figure 1. Thelubricant then passes through the channel 43 and thence through thepassage 44 into the open end 3 of the Valve casing I. It will beapparent that the lubricant thus tends to lubricate the In order tosealing member 45 has a downwardly turned inward edge as at 46 whichlies adjacent the exterior surface of the said ring member.

It will be understood that I desire to comprehend within my inventionsuch modifications as come within the scope of the claims and theinvention.

I claim:

l. The combination in a plug valve, a casing having a circular' opening,a plug member ol circular configuration rotatably mounted within acircular opening in the casing, a closure member adapted for closingsaid valve casing and for retaining said plug valve in operatingposition, said plug valve having a stem,i lubricantreceiving passagesalong the plug member for lubricating the contiguous surfaces betweensaid member and the valve casing, a ring surrounding the stem andresting on the upper surface of the plug member and within the valvecasing, said ring having a smaller diameter than the circular opening inthe valve casing above the plug to leave an annular space between thering and the interior of the casing, said closure member having achamber containing lubricant under pressure, said chamber having apassageway formed in the closure member and communieating with saidannular space at the upper surface o1" the plug member in order to applylubricant under pressure to the lubricating passages along the plugmember.

2. The combination in a plug valve, a casing having a circular opening,a plug member of circular configuration rotatably mounted within saidcasing, a closure member adapted for closing the casing, said plugmember having lubricant-receiving passages for lubricating thecontiguous surfaces of the plug member and the valve casing, said plughaving a stem, packing about the stem, a ring positioned between thepacking and the plug member, said ring surrounding the stem and having asmaller diameter thanthe opening in the casing above the plug member toleave an annular space between the ring and the interior of the casing,said closure member having a chamber containing lubricant underpressure, a passageway formed in the closure member and extending fromsaid chamber as far as the packing material and also communicating withsaid annular space at the upper surface of the plug member in order toapply lubricant under pressure to each of the packing and to thelubricating passages along the plug member.

OYSTEIN JACOBSEN.

REFERENCES CITED The following references are of record in the ile ofthis patent:

Number Number 6 UNITED STATES PATENTS Name Date Brooks Nov. 18, 1873Butler Dec. 9, 1930 Clade Apr. 28, 1936 Jacobsen July 21, 1936 JacobsenAug. 8, 1939 Milliken Sept 5, 1939 Volpin Jan. 13, 1942 Kerr May 5, 1942FOREIGN PATENTS Country Date Sweden of 1938 Great Britain of 1926 GreatBritain of 1938

